Solo is patented by Nine Eagles™ ultra micro-sized version of Free Spirit, it is different from Free Spirit Micro that it is without dark light, but it offering first-time pilots the ability to learn how to fly with ease and experienced heli pilots the ability to fly anytime, anywhere indoors. It offers unsurpassed stability and incredible control through the coaxial, counter-rotating head design and 2.4GHz. It can be flown indoors almost anywhere—from an office to a small bedroom or living room.